The most fundamental rule of thumb, the best overall guideline:
Play tit-for-tat.
That is, on the first encounter cooperate, and from then on scrupulously cooperate or defect as per the other’s last move. Advice for this rule would be to take some time to ensure you communicate your cooperation moves clearly (make sure the other knows you’re cooperating when you’re cooperating, and let them figure out defect moves by themselves).
The most fundamental rule of thumb, the best overall guideline:
Play tit-for-tat.
That is, on the first encounter cooperate, and from then on scrupulously cooperate or defect as per the other’s last move. Advice for this rule would be to take some time to ensure you communicate your cooperation moves clearly (make sure the other knows you’re cooperating when you’re cooperating, and let them figure out defect moves by themselves).